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/*
 * crt0 startup code for user programs running under Cygmon
 *
 * Copyright (c) 1998 Cygnus Support
 *
 * The authors hereby grant permission to use, copy, modify, distribute,
 * and license this software and its documentation for any purpose, provided
 * that existing copyright notices are retained in all copies and that this
 * notice is included verbatim in any distributions. No written agreement,
 * license, or royalty fee is required for any of the authorized uses.
 * Modifications to this software may be copyrighted by their authors
 * and need not follow the licensing terms described here, provided that
 * the new terms are clearly indicated on the first page of each file where
 * they apply.
 */
 
#ifndef NEED_UNDERSCORE
#define SYM(X) X
#else
#define SYM(X) _ ## X
#endif
 
.data
        .align  8
SYM(environ):
        .long   0
 
SYM(argc):
        .long   0
 
        .text
        .align 4
 
        .globl SYM(_start)
SYM(_start):
        /* see if the stack is already setup. if not, then default
         *  to using the value of %sp as set by the ROM monitor
         */
        lea __stack,%eax
        cmpl $0,%eax
        jz 1f
        mov %eax, %esp
1:
        mov $0, %ebp
 
        lea __bss_start, %eax
2:
        movb $0,(%eax)
        inc %eax
        cmp $__bss_end,%eax
        jl 2b
 
2:
        pushl $SYM(__sigtramp)
        pushl $0
        call SYM(__install_signal_handler)
        add $4, %esp
 
        pushl $SYM(__do_global_dtors)
        call SYM(atexit)
        add $4, %esp
 
        call SYM(__do_global_ctors)
 
        pushl $SYM(argc)
        call SYM(__get_program_arguments)
        add $4, %esp
 
        pushl %eax
        lea SYM(argc), %ebx
        pushl (%ebx)
        call SYM(main)
        add $8, %esp
 
        /* call exit from the C library so atexit gets called, and the
         * C++ destructors get run. This calls our exit routine below
         * when it's done.
         */
        pushl %eax
        call    SYM(exit)
3:
        jmp 3b

Line No.	Rev	Author	Line
1	56	joel	`/*`
2			`* crt0 startup code for user programs running under Cygmon`
3			`*`
4			`* Copyright (c) 1998 Cygnus Support`
5			`*`
6			`* The authors hereby grant permission to use, copy, modify, distribute,`
7			`* and license this software and its documentation for any purpose, provided`
8			`* that existing copyright notices are retained in all copies and that this`
9			`* notice is included verbatim in any distributions. No written agreement,`
10			`* license, or royalty fee is required for any of the authorized uses.`
11			`* Modifications to this software may be copyrighted by their authors`
12			`* and need not follow the licensing terms described here, provided that`
13			`* the new terms are clearly indicated on the first page of each file where`
14			`* they apply.`
15			`*/`
16
17			`#ifndef NEED_UNDERSCORE`
18			`#define SYM(X) X`
19			`#else`
20			`#define SYM(X) _ ## X`
21			`#endif`
22
23			`.data`
24			`.align 8`
25			`SYM(environ):`
26			`.long 0`
27
28			`SYM(argc):`
29			`.long 0`
30
31			`.text`
32			`.align 4`
33
34			`.globl SYM(_start)`
35			`SYM(_start):`
36			`/* see if the stack is already setup. if not, then default`
37			`* to using the value of %sp as set by the ROM monitor`
38			`*/`
39			`lea __stack,%eax`
40			`cmpl $0,%eax`
41			`jz 1f`
42			`mov %eax, %esp`
43			`1:`
44			`mov $0, %ebp`
45
46			`lea __bss_start, %eax`
47			`2:`
48			`movb $0,(%eax)`
49			`inc %eax`
50			`cmp $__bss_end,%eax`
51			`jl 2b`
52
53			`2:`
54			`pushl $SYM(__sigtramp)`
55			`pushl $0`
56			`call SYM(__install_signal_handler)`
57			`add $4, %esp`
58
59			`pushl $SYM(__do_global_dtors)`
60			`call SYM(atexit)`
61			`add $4, %esp`
62
63			`call SYM(__do_global_ctors)`
64
65			`pushl $SYM(argc)`
66			`call SYM(__get_program_arguments)`
67			`add $4, %esp`
68
69			`pushl %eax`
70			`lea SYM(argc), %ebx`
71			`pushl (%ebx)`
72			`call SYM(main)`
73			`add $8, %esp`
74
75			`/* call exit from the C library so atexit gets called, and the`
76			`* C++ destructors get run. This calls our exit routine below`
77			`* when it's done.`
78			`*/`
79			`pushl %eax`
80			`call SYM(exit)`
81			`3:`
82			`jmp 3b`

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[/] [or1k/] [branches/] [newlib/] [newlib/] [libgloss/] [i386/] [cygmon-crt0.S] - Blame information for rev 1777